Nutrafin's pH Low Range Test (6.0 - 7.6) measures pH levels in freshwater aquariums containing most common tropical fish, such as Tetras, Discus, and Angels. pH should be monitored regularly as it can directly affect the well-being of fish. The kit provides up to 225 tests and includes: One 18 mL (0.6 fl oz) Bottle of pH Low Range reagent One Glass test tube with cap One Pipette One Lab base One Instruction booklet.